A SATISFACTORY adjustable needle valve for admitting a small constant flow of gas into a highly exhausted vessel is difficult to make. A number of ingenious forms have been described by various ...

Flow is controlled by either throttling or diverting it. Throttling involves reducing orifice size until all of the flow cannot pass through the orifice; bypassing involves routing part of the flow ...

Smartflow s combine manually adjustable needle valves, flowmeters, and temperature gages in one package. The flow regulator comes in three connection sizes: 1 /4, 3 /8, and 1 /2-in. inlets all with ...